Meh...
1) Don't get this abstract level style at all (candy level looks like straight from Earthworm Jim 2). Nothing like cartoon vibe of Sonic 3 and Sonic Generations. 2D style gameplay looks broken thanks to physics (similar to Sonic 4?).
2) Graphics looks really outdated, nothing like gameplay in trailer. On par with this generation sonic games (and this is suppose to be Wii U powerhouse, Sonic 06 sure was for PS3 and Xbox 360).
Also, fight with Robotnik - boring? Booo....You don't fight him, but rather his machinery, witch is totally different from level to level, from game to game, I don't want boring Mario style bosses,
Rather play Sonic Generation again.